Improvement in furnace grate-bars



H. M.*HANFOR D & W. HULLADAY. furnacellrat'ehars.

- N0.154,3v30 A PafemedAug.25,1a74.

i Off 1` 'N A THE GRAPH 6 C0 PHOTO ITK 398`4-l PARK PLACE NY STATES'v PATENT OFF-ICE.

HENRY M. HANFORD AND WILLIAM HOLLADAY, OF BLAIRSTOVVN, IOWA.

vIMPROVEMENT IN FURNACE GRATE-BARS.

Specification forming part of Letters Patent No. 154,330, dated August 25, 1874; applicationled July 29, 1874. v

To all whom it may concern;

Be it known that we, HENRY M. HANFORD and WILLIAM HGLLADAY, of Blairstown, in the county of Benton and State of Iowa, have jointly invented certain new and useful Improvements in Furnace Grate-Bars; and we do hereby declarethat the following is a full, clear, and exact description thereof, which will enable others skilled. in the art to which it pertains to make and use the same, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to grate-bars for furnaces. Its object is to provide a suitable construction of grate for removing the clinkers in an effective manner, and without liability of displacing the bars by rocking, and thereby wasting the fuel. `Its construction also permits of the free discharge of ashes, and a free 'draft of air, which latter, however, may be retarded when it is desired to slow the re slightly. Our invention, therefore, consists, principally, of a series of stationary bars placed at some 'distance apart to form spaces, in combination with a series of double-concavecylinder-troughs, rotatable below the base of said stationary bars, and filling the spaces between said bars, for the purpose of receiving clinkers andy ashes, and dumping them into the ash-pan when desired. It also consists in the double concave cylinder clinker and ash receiving troughs, provided with cutting-edges to drive through the bed of clinkers below the grate-bars, against the loweredges of which the cutting trough-edges act.

In the accompanying drawings, Figure 1 represents a plan view of my improved furnace grate-bars applied to a boiler-furnace; Fig. 2, a vertical cross-section; Fig. 3, a vertical longitudinal sect-ion taken at line x w of Fig. 1 and FigA, a view, in perspective, of

one of the double-concave troughs.

Upon a ledge or oli'set, A, in the inner wall of the furnace, a frame, B, rests, to which frame' are secured, or cast with it at distances apart, the stationary grate-bars C, extending from end to end, which bars, in the example shown, are beveled on their upper surfaces: and provided with longitudinal perforations a a, andin their cross-section display a semielliptical shell. They* are supported and braced by trusses b b, cross-braced, as shown at c, at intervals.

This exact construction, however, may be dispensed with, and imperforated or solid bars used, or bars of greater bulk, with perforations at such intervals as not to weaken them. It is thought, however, that the construction shown is perfectly adapted for the purpose.

Resting in bearings in said ledge A, near the base of the frame of the stationary bars C, and just between said bars, are doubleconcave troughs D, which form the bottoms to the grate-bar spaces, and have their journals projectingthrough the walls of the furnace at the front, terminating in square heads d, for the purpose of receiving a wrench or` crank-lever, E, when it is desired to rotate or shake said troughs.

. These troughs are formed by hollowing out, in concaves, the two sides f a solid cylinder. Each one, therefore, presents four knife-edges as the boundaries of the troughs, which may singly, or all one after the other, be made to cut through the clinkers resting thereon by rotating the cylinder in one direction or the other to dump it; or it may be oscillated in either direction before being dumped.

When at rest, as shown in Fig. l, the troughs of the cylinders are presented for the reception of clinkers and ashes. These troughs may have perforations e for the ad- `mission of air and discharge of ashes.

When it is desired to slow the fire, the round surface of the cylinder may be presented, which, being imperforate, shuts out the draft from these troughs by closing up the spaces between the grate-bars, The troughs ll the intervening space between the grate-bars, but do not touch them, but approach them suificiently to eifect the cutting action stated.

We claim- 1. Stationary grate-bars placed at a distance apart, in combination with rotatable base-troughs for vreceiving and discharging we have axed our signatures in presence of clinkers and ashes7 as described. two Witnesses. 2. The double-concave cylinder rotatable HENRY M. HANFORD.

troughs provided with knife-edges, to act in WILLIAM HOLLADAY.

connection with the base of fixed grate-bars Witnesses:

to cut through the elinkers, as described. JOHN F. GREER,

, In testimony thatl We claim the foregoing JACOB K. WAGNER. 

